jellyfin-server/MediaBrowser.MediaEncoding/Encoder/EncoderValidator.cs

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C#
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using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
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using System.Linq;
using System.Text.RegularExpressions;
using MediaBrowser.Model.Diagnostics;
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using Microsoft.Extensions.Logging;
namespace MediaBrowser.MediaEncoding.Encoder
{
public class FFmpegVersion
{
private readonly int _major;
private readonly int _minor;
private const int _unknown = 0;
public FFmpegVersion(string p1)
{
var match = Regex.Match(p1, @"(?<major>\d+)\.(?<minor>\d+)");
if (match.Groups["major"].Success && match.Groups["minor"].Success)
{
_major = int.Parse(match.Groups["major"].Value);
_minor = int.Parse(match.Groups["minor"].Value);
}
else
{
_major = _unknown;
_minor = _unknown;
}
}
public override string ToString()
{
switch (_major)
{
case _unknown:
return "Unknown";
default:
return string.Format("{0}.{1}",_major,_minor);
}
}
public bool Unknown()
{
return _major == _unknown;
}
public bool Below(FFmpegVersion checkAgainst)
{
return ToScalar() < checkAgainst.ToScalar();
}
public bool Above(FFmpegVersion checkAgainst)
{
return ToScalar() > checkAgainst.ToScalar();
}
public bool Same(FFmpegVersion checkAgainst)
{
return ToScalar() == checkAgainst.ToScalar();
}
private int ToScalar()
{
return (_major * 1000) + _minor;
}
}
public class EncoderValidator
{
private readonly ILogger _logger;
private readonly IProcessFactory _processFactory;
public EncoderValidator(ILogger logger, IProcessFactory processFactory)
{
_logger = logger;
_processFactory = processFactory;
}
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public (IEnumerable<string> decoders, IEnumerable<string> encoders) Validate(string encoderPath)
{
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_logger.LogInformation("Validating media encoder at {EncoderPath}", encoderPath);
var decoders = GetCodecs(encoderPath, Codec.Decoder);
var encoders = GetCodecs(encoderPath, Codec.Encoder);
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_logger.LogInformation("Encoder validation complete");
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return (decoders, encoders);
}
public bool ValidateVersion(string encoderAppPath, bool logOutput)
{
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string output = null;
try
{
output = GetProcessOutput(encoderAppPath, "-version");
}
catch (Exception ex)
{
if (logOutput)
{
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_logger.LogError(ex, "Error validating encoder");
}
}
if (string.IsNullOrWhiteSpace(output))
{
return false;
}
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_logger.LogDebug("ffmpeg output: {Output}", output);
if (output.IndexOf("Libav developers", StringComparison.OrdinalIgnoreCase) != -1)
{
return false;
}
// The min and max FFmpeg versions required to run jellyfin successfully
FFmpegVersion minRequired = new FFmpegVersion("4.0");
FFmpegVersion maxRequired = new FFmpegVersion("4.0");
// Work out what the version under test is
FFmpegVersion underTest = GetFFmpegVersion(output);
if (logOutput)
{
_logger.LogInformation("FFmpeg validation: Found ffmpeg version {0}", underTest.ToString());
if (underTest.Unknown())
{
if (minRequired.Same(maxRequired))
{
_logger.LogWarning("FFmpeg validation: We recommend ffmpeg version {0}", minRequired.ToString());
}
else
{
_logger.LogWarning("FFmpeg validation: We recommend a minimum of {0} and maximum of {1}", minRequired.ToString(), maxRequired.ToString());
}
}
else if (underTest.Below(minRequired))
{
_logger.LogWarning("FFmpeg validation: The minimum recommended ffmpeg version is {0}", minRequired.ToString());
}
else if (underTest.Above(maxRequired))
{
_logger.LogWarning("FFmpeg validation: The maximum recommended ffmpeg version is {0}", maxRequired.ToString());
}
else
{
// Version is ok so no warning required
}
}
return !underTest.Below(minRequired) && !underTest.Above(maxRequired);
}
/// <summary>
/// Using the output from "ffmpeg -version" work out the FFmpeg version.
/// For pre-built binaries the first line should contain a string like "ffmpeg version x.y", which is easy
/// to parse. If this is not available, then we try to match known library versions to FFmpeg versions.
/// If that fails then we use one of the main libraries to determine if it's new/older than the latest
/// we have stored.
/// </summary>
/// <param name="output"></param>
/// <returns></returns>
static private FFmpegVersion GetFFmpegVersion(string output)
{
// For pre-built binaries the FFmpeg version should be mentioned at the very start of the output
var match = Regex.Match(output, @"ffmpeg version (\d+\.\d+)");
if (match.Success)
{
return new FFmpegVersion(match.Groups[1].Value);
}
else
{
// Try and use the individual library versions to determine a FFmpeg version
// This lookup table is to be maintained with the following command line:
// $ ./ffmpeg.exe -version | perl -ne ' print "$1=$2.$3," if /^(lib\w+)\s+(\d+)\.\s*(\d+)/'
var lut = new ReadOnlyDictionary<FFmpegVersion, string>
(new Dictionary<FFmpegVersion, string>
{
{ new FFmpegVersion("4.1"), "libavutil=56.22,libavcodec=58.35,libavformat=58.20,libavdevice=58.5,libavfilter=7.40,libswscale=5.3,libswresample=3.3,libpostproc=55.3," },
{ new FFmpegVersion("4.0"), "libavutil=56.14,libavcodec=58.18,libavformat=58.12,libavdevice=58.3,libavfilter=7.16,libswscale=5.1,libswresample=3.1,libpostproc=55.1," },
{ new FFmpegVersion("3.4"), "libavutil=55.78,libavcodec=57.107,libavformat=57.83,libavdevice=57.10,libavfilter=6.107,libswscale=4.8,libswresample=2.9,libpostproc=54.7," },
{ new FFmpegVersion("3.3"), "libavutil=55.58,libavcodec=57.89,libavformat=57.71,libavdevice=57.6,libavfilter=6.82,libswscale=4.6,libswresample=2.7,libpostproc=54.5," },
{ new FFmpegVersion("3.2"), "libavutil=55.34,libavcodec=57.64,libavformat=57.56,libavdevice=57.1,libavfilter=6.65,libswscale=4.2,libswresample=2.3,libpostproc=54.1," },
{ new FFmpegVersion("2.8"), "libavutil=54.31,libavcodec=56.60,libavformat=56.40,libavdevice=56.4,libavfilter=5.40,libswscale=3.1,libswresample=1.2,libpostproc=53.3," }
});
// Create a reduced version string and lookup key from dictionary
var reducedVersion = GetVersionString(output);
var found = lut.FirstOrDefault(x => x.Value == reducedVersion).Key;
return found ?? new FFmpegVersion("Unknown");
}
}
/// <summary>
/// Grabs the library names and major.minor version numbers from the 'ffmpeg -version' output
/// and condenses them on to one line. Output format is "name1=major.minor,name2=major.minor,etc."
/// </summary>
/// <param name="output"></param>
/// <returns></returns>
static private string GetVersionString(string output)
{
string pattern = @"((?<name>lib\w+)\s+(?<major>\d+)\.\s*(?<minor>\d+))";
RegexOptions options = RegexOptions.Multiline;
string rc = null;
foreach (Match m in Regex.Matches(output, pattern, options))
{
rc += string.Concat(m.Groups["name"], '=', m.Groups["major"], '.', m.Groups["minor"], ',');
}
return rc;
}
private static readonly string[] requiredDecoders = new[]
{
"mpeg2video",
"h264_qsv",
"hevc_qsv",
"mpeg2_qsv",
"vc1_qsv",
"h264_cuvid",
"hevc_cuvid",
"dts",
"ac3",
"aac",
"mp3",
"h264",
"hevc"
};
private static readonly string[] requiredEncoders = new[]
{
"libx264",
"libx265",
"mpeg4",
"msmpeg4",
"libvpx",
"libvpx-vp9",
"aac",
"libmp3lame",
"libopus",
"libvorbis",
"srt",
"h264_nvenc",
"hevc_nvenc",
"h264_qsv",
"hevc_qsv",
"h264_omx",
"hevc_omx",
"h264_vaapi",
"hevc_vaapi",
"ac3"
};
private enum Codec
{
Encoder,
Decoder
}
private IEnumerable<string> GetCodecs(string encoderAppPath, Codec codec)
{
string codecstr = codec == Codec.Encoder ? "encoders" : "decoders";
string output = null;
try
{
output = GetProcessOutput(encoderAppPath, "-" + codecstr);
}
catch (Exception ex)
{
_logger.LogError(ex, "Error detecting available {Codec}", codecstr);
}
if (string.IsNullOrWhiteSpace(output))
{
return Enumerable.Empty<string>();
}
var required = codec == Codec.Encoder ? requiredEncoders : requiredDecoders;
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var found = Regex
.Matches(output, @"^\s\S{6}\s(?<codec>[\w|-]+)\s+.+$", RegexOptions.Multiline)
.Cast<Match>()
.Select(x => x.Groups["codec"].Value)
.Where(x => required.Contains(x));
_logger.LogInformation("Available {Codec}: {Codecs}", codecstr, found);
return found;
}
private string GetProcessOutput(string path, string arguments)
{
IProcess process = _processFactory.Create(new ProcessOptions
{
CreateNoWindow = true,
UseShellExecute = false,
FileName = path,
Arguments = arguments,
IsHidden = true,
ErrorDialog = false,
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RedirectStandardOutput = true,
// ffmpeg uses stderr to log info, don't show this
RedirectStandardError = true
});
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_logger.LogDebug("Running {Path} {Arguments}", path, arguments);
using (process)
{
process.Start();
try
{
return process.StandardOutput.ReadToEnd();
}
catch
{
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_logger.LogWarning("Killing process {Path} {Arguments}", path, arguments);
// Hate having to do this
try
{
process.Kill();
}
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catch (Exception ex)
{
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_logger.LogError(ex, "Error killing process");
}
throw;
}
}
}
}
}